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https://issues.apache.org/jira/browse/HBASE-8868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16816800#comment-16816800
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Wei-Chiu Chuang commented on HBASE-8868:
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Assign to myself. Looks like this is still lacking. I have a patch to expose 
various metrics from HDFS client input stream. Will attach soon.

> add metric to report client shortcircuit reads
> ----------------------------------------------
>
>                 Key: HBASE-8868
>                 URL: https://issues.apache.org/jira/browse/HBASE-8868
>             Project: HBase
>          Issue Type: Improvement
>          Components: metrics, regionserver
>    Affects Versions: 0.94.8, 0.95.1
>            Reporter: Viral Bajaria
>            Assignee: Wei-Chiu Chuang
>            Priority: Minor
>
> With the availability of shortcircuit reads, when the feature is enabled 
> there is no metric which exposes how many times the regionserver was able to 
> shortcircuit the read and not make a IPC to the datanode.
> It will be great to add the metric and expose it via Ganglia.



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